Question

find 15th term of AP's a=2 and d=5
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Answer 1

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Answer 2

Given:-

• First term (a) = 2
• Common difference (d) = 5
• n = 15

To find:-

• 15th term.

Solution:-

We know,

$\sf{a_n = a + (n-1)\times d}$

= $\sf{a_{15} = 2 + (15 - 1)\times 5}$

= $\sf{a_{15}= 2 + 14\times 5}$

= $\sf{a_{15} = 2 + 70}$

= $\sf{a_{15} = 72}$

$\sf{\therefore 15th\: term = 72}$.